KP already tries to load the best available quality and you've found a special case.
Icon loading on Windows is not a trivial thing as the file format is inherited from the 16bit days and it is such a compatibility mess that some icon creator applications just do it wrong.
This require investigation.
It appears the icon format is perfectly standard in your example. Only Keypirinha's algorithm to choose the best available icon was incorrect in this case. It's fixed and will be available in next release. Thanks for your feedback.